After running one of the troubleshooters in Windows and looking for the
details of the finding, I received the following error message: "The XML page
cannot be displayed. Cannot view XML input using XSL style sheet. Please
correct the error and then click the Refresh button or try again later. Class
Factory cannot supply the requested class." I have no idea what this means and
I don't know how to correct the supposed error. Can you help me?

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In this excerpt from
Answercast #92 I look at a computer system with missing XML software. There
are a few steps, short of going to a technician, that may fix it.

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"The XML page cannot be displayed"

Maybe...

What this boils down to is that the troubleshooter is apparently trying to
display some information that has been encoded using XML. XML is just another
file format, if you will. The software that is normally used to understand XML
is, for whatever reason, not on your system or there's something wrong with
it.

System file checker

My recommendation, in a case like this (since that should be a part
of Windows) would be start with the system file checker. I've got an article on
the system
file checker and how to run it.

What it basically does is it takes a look at the files that comprise Windows
itself and makes sure that they're okay- and if they're not, it tries to
restore them to the versions that they should be.

That does imply that you may need your installation CD or DVD for Windows
when you use SFC - but that's the thing to start with.

At a minimum, it's a good place to start looking to see if there is a
problem. Even if you can't necessarily fix it that's data then for the next
step which, I suspect, may involve having a technician have a look at the
machine.

Possible reinstall

The unfortunate problem is that the real next step for the average user is
to go ahead and reinstall Windows from scratch. Though there is a step in front
of that which is to run a repair reinstall of Windows which may solve this
problem.

But before we go that far down the line, I would start with you SFC and see
if that doesn't identify a problem and potentially resolve it for you.

Leo A. Notenboom has been playing with computers since he
was required to take a programming class in 1976. An 18 year career as a programmer at Microsoft soon followed.
After "retiring" in 2001, Leo started Ask Leo! in 2003 as a place for answers
to common computer and technical questions. More about Leo.